4 University of Michigan 



metron, has been given by Gibson (1910).^ As the three 

 described species cannot, however, at present be satisfactorily- 

 placed elsewhere in the system, they may provisionally be 

 retained in the following nominal genus. 



Genus I. Amphioxides Gill 



Amphioxides Gill (1895); Jordan and Evermann (1903); 

 Goldschmidt (1905; 1906). 



Genotype. — Branchiostoma pelagicuin Giinther. 



I. Amphioxides pelagictis Giinther 



Branchiostoma pelagicuin Giinther (1889); Kirkaldy (1895); (?) 

 Cooper (1903) ; Tattersall (1903) ; Herdman (1904) ; Lonnberg (1905). 



Ampliioxidcs pelagicus Gill (1895); Jordan and Evermann (1903); 

 Parker (1904) ; Goldschmidt (1905). 



2. Amphioxides valdiviae Goldschmidt 

 Amphioxides valdiviac Goldschmidt (1905). 



3. Amphioxides sternnrus Goldschmidt 

 Amphioxides steniirus Goldschmidt (1905). 



Family Branchiostomatidae; Bonaparte 



This family is here restricted to include only Branchiostoma 

 and the closely related genus Dolichorhamphus. 



Genus 2. Branchiostoma Costa 

 Branchiostoma Costa (1834) and most systematists. 

 Genotype. — Branchiostoma lubricum Costa. 

 Amphioxus Yarrell (1836) and morphologists in general. 

 Genotype. — Limax lanceolatus Pallas. 



- References in this list are not given in full. They can be readily 

 located with the help of Dean's Bibliography of Fishes or the Zoolog- 

 ical Record. 



